Air forcing apparatus for air furnaces



A ril 11, 1933. w. N. MUELLER AIR FORCING APPARATUS FOR AIR FURNACES Filed June 17, 1930 2 Sh eets-Sheet l JMkw u a Z Z6! April 11,1933. I w MUELLER 1,903,552

AIR FORCING APPARATUS FOR AIR FURNACES Filed June 17, 1930 2 Sheets-Sheet 2 3mm WNMW 1 Patented Apr. 11, 1933 WILLIAM N. MoiiLLEn, or'rnnnnnlcxsnone, IOWA AIR FORCING APPARATUS 1503- AIR FURNACES Application filed .Tune 17, 1930. Serial No. 461,817., i

The present invention relates to circulating devices for air furnaces and more particularly to a device adapted to circulate the warm air about the heated furnace so as to force the air upwardly through the air ducts.

An object of this invention is to provide a device which is adapted to be inserted in the cold air duct of a hot air furnace which is so constructed as to permit the cold air toreadily flow into the casing about the heated furnace and which is also provided with means by which the cold air may be forced into the furnace and simultaneously the heated air within the furnace shell forced upwardly through the air ducts.

Another object of this invention is to provide a device of this character with means by which the cold air may normally pass into and about the furnace casing and with means by which the air may be forced through the air ducts, the forcing of the air through the ducts automatically closing the remaining passageways so that the direction of the air will not be reversed.

A further object of this invention is to provide a plurality of dampers or swingable closure members which are balanced in a suit able frame and to provide a fan or air forcing member which is also mounted within the frame, the frame being positioned in an air duct and the fan normally maintained inoperative. The dampers within the frame are so constructed that when the fan is operative they will be forced into closed position so that only the air passing through the fan will enter the furnace.

The above and various other objects and advantages of this invention will in part be described in and in part be understood from the following detailed description of the present preferred embodiment, the same being illustrated in the accompanying drawings wherein Figure 1 is a detail front elevation of a device constructed according to the preferred embodiment of this invention;

Figure 2 is a sectional view partly in detail taken on the line 22 of Figure 1;

Figure 3 is a sectional view taken on the line 8-3 of Figure 2; and

ing one of the dampers in closed position under the action of the fan.

Referring tothe drawings wherein like numerals of reference designate correspond- Q ing parts throughout the several views, the

numeral 10 designates generally a frame which may be of any desired configuration and size and which is so constructed that it may be readilymounted in an'air duct of am preferably in the cold spaced relation to each other and a plurality (5B of transverse bars 12lare secured between the horizontal members 11, the bars 12 beinlg mounted in spaced parallel relation to eat other. Thetransverse bars 12 are adapted to divide the" frame 11' into a pluralityf' of openings or passageways 13 and one of the passageways is closed by 'a'panel orrplate member 14 and a cylindrical duct 15 is secured to the panel 14, the panel 14 being cut awa so as to ermit'the free assa e of air y p .p b

through the duct 15.

' X damper 16 is secured in each of the open passageways 13,'being swingably mounted: on pivotal members 17 and the pivotal members 17 are so mounted that the dampers or closure members 16 are balanced so that they will be normally maintained in open position. If de sired, a weight 18 may be secured to one end be balanced uponthe pivots 17.

An elongated fin or'flag 19 is secured to a portion ofthe dampers 16 so that they will stem 20, the stem 20 being secured at one end .to, the inner edge portion of the dampers 16 and the free end of the fins 19 are preferably normally interposed within the line or plane of the air duct 15. A fan 21 of conventional construction is'suspended by means of bolts 22 within the duct 15 and if desired suitable tensioning springs 23 may be secured at one end to the casing of the fan and at the opposite end to the bolts 22 so that the fan21 will be cushioned or resiliently mounted within the air duct 15. V e y The dampers 16 are preferably provided with flanges 24 which are formed integrally 5100 Figure 4 is a vertical sectional view showwith the body of the damper, the flanges 24 air from the fan will strike the fins 19 and swing the fins'into a position where the edge of the fins is in alignment withthe draft of air. The swinging of the fins 19 by the fan 21 will coactively close the dampers 16 so that all of the air passing through the air duct 15 will flow into the furnace and will not be permitted to flow in a reverse direction. During the time that the fan 21 is inoperative the air will of course be permitted to normally pass through the air duct 15 so that the passage of air within the duct will not be impaired to a great extent.

When it is desired to increase the flow of air through the air duct of the furnace the fan may be operated, the operation of the fan 1 WlLLI-AM N. MUELLER.

automatically closing the dampers 16 as hereinbefore stated.

It is, of course, understood that various changes and modifications may be made in the details of construction and design of the above specifically described embodiment of the invention without departing from the spirit thereof, such changes and modifications being restricted only by the scope of the following claims.

What is claimed is 1. An air circulating device of the character described comprising a frame adapted to be positioned in an air duct, a fan carried by the frame, an air duct positioned about the fan, a rockable damper mounted in the frame and positioned on one side of the air duct and normally disposed in horizontal open position, an arm fixedly carried bysaid damper, an outstanding fin carried by said arm and extending into said air duct, said fin upon operation of the fan being adapted to be forced into alignment with the draft of air and coactively swing the damper into vertical closed position. i

2. An air circulating device of the character described comprising a frame adapted to be positioned in an air duct, saidframe comprising a pair of parallel side members, end members maintaining said side members in spaced relation to each other, a pair of intermediate members positioned between said side members whereby to divide the frame into a plurality of panels, a metal panel secured between said side members and a pair of said intermediate members, a cylindrical air duct secured to said metal panel, a fan positioned in said air duct, damper members 

